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角的認識
Author:
whtong
GeoGebra
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四邊形的特性
兩位數除以一位數（二）
三位數除以一位數（二）
sanjiaohanshu
兩組對邊相等的四邊形
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九點圓 (9-Point Circle)
開始製作你的GGB
Apollonius Problem 6 CLP Inversion 12
四邊形外接正方形
四邊形內部反射_長寬角度可調整
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Normal Distribution
Rational Numbers
Indefinite Integral
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